According to wikipedia:
"Abdul Kadir was an Ottoman pre-dreadnought battleship laid down in 1892 at the Constantinople dockyard. After she was framed with armor near the turn of the 20th century, very little work was done to her other than to plate in the area near the keel before work ceased. When work was scheduled to resume in full force in 1904, the keel blocks had shifted and rendered her a total loss. She was scrapped in the slipway in 1914, near the start of World War I. She was to have a main armament of four 283-millimeter (11 in) guns, mounted in barbettes protected by 6 inches (152 mm) of armor."
And according to springsharp:
"In 1904, he planned his equipment in the 4x254 and 10x150" (quick translation from polish)
SO!
Here are the 2 references pictures i've found on the web.
The first one is a plan and side view of the Turkish battleship Abdul Kadir from the 1904 issue of Flottes de Combat (probably drawn early in that year).
Second one is supposed to be a picture of the ship model in the galatasaray navy museum. It looks very russian to me..........
It may refer to how the project were suppossed to be finished in 1904 (4x254 and 10x150), so this would explain why the main turrets looks like the one of the russian Rostislav who add the same main gun caliber.